Advanced WEC Dynamics and Controls MASK3 Test

Coe, Ryan G.; Bacelli, Giorgio; Spencer, Steven J.; Forbush, Dominic; Dullea, Kevin J.

doi:10.2172/1592850

Cited by 11 publications

(20 citation statements)

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“…The Energies 2021, 14, 760 of 20 vertical position of the float is measured by the sinusoidal encoder of the actuator, while the vertical force is measured by load cells. More information about the experimental data acquisition can be found in [55][56][57].…”

Section: Experimental Campaignmentioning

confidence: 99%

“…The vertical position of the float is measured by the sinusoidal encoder of the actuator, while the vertical force is measured by load cells. More information about the experimental data acquisition can be found in [55][56][57]. Physical tests were conducted in the Maneuvering and Sea Keeping (MASK) basin located in the Naval Surface Warfare Center, Carderock Division.…”

Section: Experimental Campaignmentioning

confidence: 99%

“…The monochromatic force input considered here is the one from Case130 of the MASK3 experimental campaign [57]: a sinusoidal signal with an amplitude of 800 N and a frequency of 0.60 Hz, which corresponds to a period of 1.67 s.…”

Section: Monochromatic Force Signalmentioning

confidence: 99%

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Modelling a Heaving Point-Absorber with a Closed-Loop Control System Using the DualSPHysics Code

et al. 2021

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The present work addresses the need for an efficient, versatile, accurate and open-source numerical tool to be used during the design stage of wave energy converters (WECs). The device considered here is the heaving point-absorber developed and tested by Sandia National Laboratories. The smoothed particle hydrodynamics (SPH) method, as implemented in DualSPHysics, is proposed since its meshless approach presents some important advantages when simulating floating devices. The dynamics of the power take-off system are also modelled by coupling DualSPHysics with the multi-physics library Project Chrono. A satisfactory matching between experimental and numerical results is obtained for: (i) the heave response of the device when forced via its actuator; (ii) the vertical forces acting on the fixed device under regular waves and; (iii) the heave response of the WEC under the action of both regular waves and the actuator force. This proves the ability of the numerical approach proposed to simulate accurately the fluid–structure interaction along with the WEC’s closed-loop control system. In addition, radiation models built from the experimental and WAMIT results are compared with DualSPHysics by plotting the intrinsic impedance in the frequency domain, showing that the SPH method can be also employed for system identification.

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Section: Experimental Campaignmentioning

confidence: 99%

Section: Experimental Campaignmentioning

confidence: 99%

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Modelling a Heaving Point-Absorber with a Closed-Loop Control System Using the DualSPHysics Code

et al. 2021

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“…Figure 4 depicts two devices that are presented as examples herein. Figure 4a shows the "Wave-Bot," which is a point absorber capable of motion in heave, surge, and pitch [32]. In this example, we consider the heave mode of the WaveBot in isolation.…”

Section: How Does a Wec Impedance Look?mentioning

confidence: 99%

“…In this example, we consider the heave mode of the WaveBot in isolation. Figure 4b shows the "floating oscillating surge wave energy converter (FOSWEC)," which has two pitching flaps -one at "bow" and one at the "aft" -normal to the wave propagation direction [33]. These devices have both been experimentally tested and the ensuing models are produced via system identification (SID) methods [34][35][36].…”

Section: How Does a Wec Impedance Look?mentioning

confidence: 99%

A practical approach to wave energy modeling and control

Coe¹,

Bacelli²,

Forbush³

2020

Preprint

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The potential for control design to dramatically improve the economic viability of wave energy has generated a great deal of interest and excitement. However, for a number of reasons, the promised benefits from better control designs have yet to be widely realized by wave energy devices and wave energy remains a relatively nascent technology. This brief paper summarizes a simple, yet powerful approach to wave energy dynamics modeling, and subsequent control design based on impedance matching. Our approach leverages the same concepts that are exploited by a simple FM radio to achieve a feedback controller for wave energy devices that approaches optimal power absorption. If fully utilized, this approach can deliver immediate and consequential reductions to the cost of wave energy. Additionally, this approach provides the necessary framework for control co-design of a WEC, in which an understanding of the control logic allows for synchronous design of the device control system and hardware.

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